521was the smallest number without a nBAB on 27 June 2018.MathBabbler Number Analyst (MBNA) output: ========================================= 521 is natural, counting, whole, integer 521 is odd (not even) 521 is not extremely odd 521 proper divisors are: 1, 521 has 1 proper divisors 521 is deficient (sum of divisors is 1; ratio: 0.00191939) 521 is unhappy 521 is a Squarefree Number 521 is prime (not composite) ...Twin prime with 523 ...Truman Gerald (p-30) prime with 491 ...Pythagorean prime ...Eisenstein (3n-1; n=174) ...Strong prime 521 is sum of two squares ...521 = 11^2 + 20^2 521 is Recaman number 1219 521 is a Lucas number(322+199) 521 is the sum of 3 distinct cubes (1^3 + 2^3 + 8^3) 521 digital root is 8 521 in octal is 01011 521 in hexadecimal is 0x209 521 in binary is 1000001001 (is odious) 521 nearest square numbers: -37...8 (484...529 [23]) sqrt(521) = 22.8254 ln(521) = 6.25575 log(521) = 2.71684 521! is 9.17502e+1190 521 is 165.839 Pi years 521 is 26 score and 1 year 521 written as a Roman numeral is DXXI 521 is 261^2 - 260^2 and 261 + 260 = 521 521 is a multiple of 1 & it contains a 1 (A011531) ____________________________________________________ 521 reciprocal is 0.0019193857965451055662188099808061420345489443378119 remainders: 1,10,100,479,101,489,201,447,302,415,503,341,284,235,266,55,29,290,295,345,324,114,98,459,422,52,520,511,421,42,420,32,320,74,219,106,18,180,237,286,255,466,492,231,226,176,197,407,423,62,99,469,1

**Creator:** Gerald Thurman
[gthurman@gmail.com]

**Created:** 27 June 2018

This work is licensed under a Creative Commons Attribution 3.0 United States License.